... purposes)Journal of NeuroEngineering and Rehabilitation Open AccessResearch A rehabilitation tool for functional balance using altered gravity and virtual realityLars IE Oddsson*1,2, Robin Karlsson2, ... Insti-tute and a Fulbright Fellowship (Dr. Zemkova).References1. Norman KE, Pepin A, Ladouceur M, Barbeau H: A treadmill appa-ratus and harness support for evaluation and rehabilitation of gait. Arch ... regular hospital bedhas been modified to hold a pneumatic force actuator, a flat friction free surface that supports a back pack framewith air bearings, a visual surround system and a portableair-compressor....